How would you pronounce Oisin?

There really isn't an Irish pronunciation of Oisín that doesn't have the EEN ending.

It's not a question of differing Irish regional pronunciations.
And it really is very clearcut -- all the people you have heard calling it Osh-in have been wrong.

The EEN ending doesn't connote a feminine name in Ireland as it does with names of French origin that are used in Britain (and France). It is used for both boys' and girls' names as a fond diminutive and means 'little' => 'sweet' => 'darling' (for instance Páidín/Paudeen = an affectionate way of addressing someone named Patrick/Pádraig).

With Oisín, the EEN ending doesn't have the 'little' meaning, however; it's an inbuilt part of the name, not a suffix.

I recommend going with the Welsh version too.

I know someone whose ds is called Ossian

Always sounds like "Ocean" when she calls him and I thought this was the spelling til I wrote his birthday card and got told off for it

It really is as clear as the books make out to be honest, it's pronounced Uh-sheen. I've met lots over the years and they've all pronounced it this way. Maybe the Oisíns you knew weren't Irish and their parents made a mistake re. pronunciation?

Going for the Welsh version sounds a good idea though as that's much closer to the sound that you like.

It's Uh - sheen. Although I do know Irish people who have pronounced it more like Osheen and I tend to say it "Usheen" - but then I'm not Irish. Our poor Oisín has had his name said in so many ways - Oshin, Oyzin, Wuzzin (someone thought it was French! and related to oiseau..!)

Mind you, it can't be Oshin, as others have said, because of the fada or accute accent on the second "i" which makes it long.

Whether you like the name depends on you. But the story behind the name is pretty stirring, I always think. Fionn Mac Cumhaill, the great Irish warrior, married Sadhbh (pronounced "Sive") who was transformed into a deer by a spell while pregnant with his child. She was lost to him for seven years but then one day Fionn heard there was a deer in the forest his hounds would not hunt.

He went out to see for himself and sitting by a doe in a clearing in the forest was a young boy. He immediately recognised the child as his own and gave him the name Oisín, which means "little deer".

It's Uh-Sheen. It would set my teeth on edge to meet one pronounced Ocean, tbh.
Like Caitlin. It's not supposed to be Kate-Lynn, it's supposed to be Kathleen.
But me being annoyed about that hasn't made any difference.

I think if you want to name him ocean, then name him ocean, but Oisin is pronounced ush-sheen

I'm in Ireland and know lots of them, always always always Uh-sheen, thats the sound the letters make, you can't just change them.

I once met a girl who said her same was Sierra. (See-air-a). Except she wrote it down and it was Ciara....the letters just don't make that sound!

I'm typing on an iPhone. Press and hold the letter you want to add the fada to. It will give you different options, including fadas.

I'm pretty sure you can type a fada on an iPhone. Also, the number of people who don't use basic punctuation when they text will mean that it's fairly immaterial anyway. But anyway, it's your choice .

I would have thought Fionn and Osian was OK?

I'd shy away from Osian and Nia / Oisin and Niamh, as they were actually a couple, but I just see the names Fionn and Osian as simply being from the same myths, rather than a pair.

But I'm not Irish so happy to be told if I'm massively missing the point here!

Oisín - it's a fairly iconic Irish name (he was the legendary son of Fionn mac Cumhaill wasn't he?) So I personally don't think you can "leave off the fada". What's the point of choosing a traditional Irish name if you're going to mess around with it?

Uh-sheen, anything else is wrong.

Ah, it's a beautiful name, go for it :) It just might have been the only one for me too

I don't reckon two "an"s matters. Loads of people have two girls with names ending with an "a" aound, or boys with names ending with an "er" sound.

I would say it means they go together!

Call him something else.
Hi, my name is taffy. I know it's spelled tigger but My mother doesn't like that pronunciation so we say taffy. Yes, I know it doesn't make sense but that's my name, ok. ( and repeat.... A lot.)

I have a number of Irish friends with boys with this name they all pronounce
O shin

Uh-sheen. Irish relatives so familiar with the name.

The Welsh version of the same name is spelt Osian and pronounced Osh-an.

Never heard any version other than Uh-sheen. Think it's a gorgeous name but doesn't go with our surname

Chiming in to echo Maryz's explanation of how the name is traditionally spelled and pronounced here in Ireland. Never heard it any other way here.

Oshan but I'm Welsh